Things become interesting. Sometimes a fork is a good thing and will accelerate development or overcome things and maybe one day it could be merged back. Though I'd still prefer one solution, not fragmented for such a core element of any Linux distribution.
But they also got to fix some issues in gentoo Diego "flameeyes" mentioned. I also noticed that there were complications on some big libs or core elements. (boost, glibc, udev, udisks...).
That is one of the few downsides of Gentoo. If upstream fucks up you're really soon to notice it - unless you go stable arch only. I still remember libpng breakage, incompatible with all before and I had to (revdep-)rebuild 80% of my system. Not even funny on a quadcore when your main system is unusable for more than a day.
Stop TCPA, stupid software patents and corrupt politicians!